Here is my 'old reliable' 1976 vintage ESTES Maxi Brute 4" V2, launching on an F21-6W.
It is in the shop right now, as repeated AP motor ejection charges have cooked the stiffer tube. I am rebuilding the mm with a BT50H heavy wall tube that is soaked in CA.
This rocket was built as light as possible. Fins are stock, and the only mods are: double engine hooks, 36" ESTES nylon chute from a Designer's Special, 36" of 3/8" elastic shock chord, and a CA soak of the body tube .